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        <a href=".." >Doughnut & Pie</a>
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                                <section class="normal markdown-section">

                                <h1 id="doughnut-and-pie">Doughnut and Pie</h1>
<p>Pie and doughnut charts are probably the most commonly used charts. They are divided into segments, the arc of each segment shows the proportional value of each piece of data.</p>
<p>They are excellent at showing the relational proportions between data.</p>
<p>Pie and doughnut charts are effectively the same class in Chart.js, but have one different default value - their <code>cutoutPercentage</code>. This equates what percentage of the inner should be cut out. This defaults to <code>0</code> for pie charts, and <code>50</code> for doughnuts.</p>
<p>They are also registered under two aliases in the <code>Chart</code> core. Other than their different default value, and different alias, they are exactly the same.</p>
<p><div class="chartjs-wrapper"><canvas id="chartjs-4" class="chartjs" width="undefined" height="undefined"></canvas><script>new Chart(document.getElementById("chartjs-4"),{"type":"doughnut","data":{"labels":["Red","Blue","Yellow"],"datasets":[{"label":"My First Dataset","data":[300,50,100],"backgroundColor":["rgb(255, 99, 132)","rgb(54, 162, 235)","rgb(255, 205, 86)"]}]}});</script></div></p>
<h2 id="example-usage">Example Usage</h2>
<pre><code class="lang-javascript"><span class="hljs-comment">// For a pie chart</span>
<span class="hljs-keyword">var</span> myPieChart = <span class="hljs-keyword">new</span> Chart(ctx,{
    type: <span class="hljs-string">&apos;pie&apos;</span>,
    data: data,
    options: options
});
</code></pre>
<pre><code class="lang-javascript"><span class="hljs-comment">// And for a doughnut chart</span>
<span class="hljs-keyword">var</span> myDoughnutChart = <span class="hljs-keyword">new</span> Chart(ctx, {
    type: <span class="hljs-string">&apos;doughnut&apos;</span>,
    data: data,
    options: options
});
</code></pre>
<h2 id="dataset-properties">Dataset Properties</h2>
<p>The doughnut/pie chart allows a number of properties to be specified for each dataset. These are used to set display properties for a specific dataset. For example, the colour of a the dataset&apos;s arc are generally set this way.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>label</code></td>
<td><code>String</code></td>
<td>The label for the dataset which appears in the legend and tooltips.</td>
</tr>
<tr>
<td><code>backgroundColor</code></td>
<td><code>Color[]</code></td>
<td>The fill color of the arcs in the dataset. See <a href="../general/colors.html#colors">Colors</a></td>
</tr>
<tr>
<td><code>borderColor</code></td>
<td><code>Color[]</code></td>
<td>The border color of the arcs in the dataset. See <a href="../general/colors.html#colors">Colors</a></td>
</tr>
<tr>
<td><code>borderWidth</code></td>
<td><code>Number[]</code></td>
<td>The border width of the arcs in the dataset.</td>
</tr>
<tr>
<td><code>hoverBackgroundColor</code></td>
<td><code>Color[]</code></td>
<td>The fill colour of the arcs when hovered.</td>
</tr>
<tr>
<td><code>hoverBorderColor</code></td>
<td><code>Color[]</code></td>
<td>The stroke colour of the arcs when hovered.</td>
</tr>
<tr>
<td><code>hoverBorderWidth</code></td>
<td><code>Number[]</code></td>
<td>The stroke width of the arcs when hovered.</td>
</tr>
</tbody>
</table>
<h2 id="config-options">Config Options</h2>
<p>These are the customisation options specific to Pie &amp; Doughnut charts. These options are merged with the global chart configuration options, and form the options of the chart.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>cutoutPercentage</code></td>
<td><code>Number</code></td>
<td><code>50</code> - for doughnut, <code>0</code> - for pie</td>
<td>The percentage of the chart that is cut out of the middle.</td>
</tr>
<tr>
<td><code>rotation</code></td>
<td><code>Number</code></td>
<td><code>-0.5 * Math.PI</code></td>
<td>Starting angle to draw arcs from.</td>
</tr>
<tr>
<td><code>circumference</code></td>
<td><code>Number</code></td>
<td><code>2 * Math.PI</code></td>
<td>Sweep to allow arcs to cover</td>
</tr>
<tr>
<td><code>animation.animateRotate</code></td>
<td><code>Boolean</code></td>
<td><code>true</code></td>
<td>If true, the chart will animate in with a rotation animation. This property is in the <code>options.animation</code> object.</td>
</tr>
<tr>
<td><code>animation.animateScale</code></td>
<td><code>Boolean</code></td>
<td><code>false</code></td>
<td>If true, will animate scaling the chart from the center outwards.</td>
</tr>
</tbody>
</table>
<h2 id="default-options">Default Options</h2>
<p>We can also change these default values for each Doughnut type that is created, this object is available at <code>Chart.defaults.doughnut</code>. Pie charts also have a clone of these defaults available to change at <code>Chart.defaults.pie</code>, with the only difference being <code>cutoutPercentage</code> being set to 0.</p>
<h2 id="data-structure">Data Structure</h2>
<p>For a pie chart, datasets need to contain an array of data points. The data points should be a number, Chart.js will total all of the numbers and calculate the relative proportion of each.</p>
<p>You also need to specify an array of labels so that tooltips appear correctly</p>
<pre><code class="lang-javascript">data = {
    datasets: [{
        data: [<span class="hljs-number">10</span>, <span class="hljs-number">20</span>, <span class="hljs-number">30</span>]
    }],

    <span class="hljs-comment">// These labels appear in the legend and in the tooltips when hovering different arcs</span>
    labels: [
        <span class="hljs-string">&apos;Red&apos;</span>,
        <span class="hljs-string">&apos;Yellow&apos;</span>,
        <span class="hljs-string">&apos;Blue&apos;</span>
    ]
};
</code></pre>


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